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LM2574-5.0BWM

Description
Switching Regulator Voltage-mode 1.8A 63kHz Switching Freq-Max BIPolar PDSO14
CategoryPower/power management    The power supply circuit   
File Size46KB,8 Pages
ManufacturerMicrel ( Microchip )
Websitehttps://www.microchip.com
Download Datasheet Parametric View All

LM2574-5.0BWM Overview

Switching Regulator Voltage-mode 1.8A 63kHz Switching Freq-Max BIPolar PDSO14

LM2574-5.0BWM Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMicrel ( Microchip )
package instructionSOP, SOP14,.4
Reach Compliance Codecompli
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage40 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G14
JESD-609 codee0
length9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals14
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1.8 A
Nominal output voltage5 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.4
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height2.65 mm
Maximum supply current (Isup)10 mA
surface mountYES
Switch configurationBUCK
Maximum switching frequency63 kHz
technologyBIPOLAR
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width7.5 mm
LM2574
Micrel
LM2574
52kHz Simple 0.5A Buck Regulator
Final Information
General Description
The LM2574 family is a series of easy to use fixed and
adjustable switching voltage regulators. The LM2574 con-
tains all of the active circuitry necessary to construct a
stepdown (buck) switching regulator and requires a minimum
of external components.
The LM2574 is available in 3.3V, 5V, and 12V fixed output
versions, or an adjustable version with an output voltage
range of 1.23V to 37V. Output voltage is guaranteed to
±4%
for specified input and load conditions.
The LM2574 can supply 0.5A while maintaining excellent line
and load regulation. The output switch includes cycle-by-
cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
An external shutdown connection selects operating or standby
modes. Standby current is less than 200µA.
Heat sinks are generally unnecessary due the regulator’s
high efficiency. Adequate heat transfer is usually provided by
soldering all package pins to a printed circuit board.
The LM2574 includes internal frequency compensation and
an internal 52kHz fixed frequency oscillator guaranteed to
±10%
of the frequency.
Circuits constructed around the LM2574 use a standard
series of inductors which are available from several different
manufacturers.
Features
• 3.3V, 5V, 12V, and Adjustable Output Versions
• Adjustable Version Output 1.23V to 37V
±4%
Max. over
Line and Load Conditions.
• Guaranteed 0.5A Output Current
• Wide Input Voltage, up to 40V
• Thermal Shutdown and Current Limit Protection
• Requires only 4 external Components.
• Shutdown Capability (Standby Mode)
• Low Power Standby Mode < 200µA Typical
• High Efficiency
• 52kHz Fixed Frequency Internal Oscillator
• Uses Standard Inductors
Applications
Simple High-efficiency Step-down (Buck) Regulator
Efficient Pre-Regulator for Linear Regulators
On-card Switching Regulators
Positive to Negative Converter (Buck-Boost)
Ordering Information
Part Number
LM2574BN
LM2574BWM
LM2574-3.3BN
LM2574-3.3BWM
LM2574-5.0BN
LM2574-5.0BWM
LM2574-12BN
LM2574-12BWM
Temp. Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
8-pin Plastic DIP
14-pin Wide SOIC
Pin Configuration
FB
SIG GND
ON/OFF
PWR GND
1
2
3
4
8
7
6
5
*
OUTPUT
*
V
IN
Typical Application
8-pin DIP (N)
40V MAX
UNREGULATED
DC IN
V
IN
*
*
FB
SIG GND
ON/OFF
PWR GND
*
1
2
3
4
5
6
7
14
13
12
11
10
9
8
*
*
OUTPUT
*
V
IN
*
*
FB
LM2574
PWR
GND
SIG
GND
OUT
ON/
OFF
11DQ05
330µH
REGULATED
OUTPUT
0.5A
C
IN
22µF
C
OUT
220µF
14-pin SOIC (WM)
Figure 1. Fixed Output Regulator Circuit
* NC: solder to printed circuit for
maximum heat transfer
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 1999
1
LM2574
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